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17beta-hydroxysteroid dehydrogenase type 7--an ancient 3-ketosteroid reductase of cholesterogenesis.

Abstract：

:17beta-hydroxysteroid dehydrogenase type 7 (17beta-HSD7) is a novel estrogenic hydroxysteroid dehydrogenase from mammals. We modeled the three-dimensional structure of human 17beta-HSD7, analyzed the phylogeny of 17beta-HSD7 homologues and determined its expression pattern by in silico Northern blotting. Predominant expression is found not only in reproductive tissues (breast, ovary, placenta) but also in liver and developing brain, principal sites of cholesterol synthesis. The substrate binding pocket is opening towards a conserved membrane-associated helix, which is indicative for a conversion of a membrane component. 17beta-HSD7 shows significant homology to a yeast 3-ketosteroid reductase (ERG27) involved in ergosterol biosynthesis. Our results lead to the conclusion that 17beta-HSD7 is not only involved in estradiol production but plays another (and possibly more important) role as a 3-ketosteroid reductase in cholesterogenesis. This agrees with the striking absence of 17beta-HSD7 homologues in the complete genomes of Drosophila and C. elegans, which are both auxotrophic for cholesterol.

journal_name

Mol Cell Endocrinol

journal_title

Molecular and cellular endocrinology

authors

Breitling R,Krazeisen A,Möller G,Adamski J

doi

10.1016/s0303-7207(00)00416-0

keywords:

subject

Has Abstract

pub_date

2001-01-22 00:00:00

pages

199-204

issue

1-2

eissn

0303-7207

issn

1872-8057

pii

S0303-7207(00)00416-0

journal_volume

171

pub_type

杂志文章

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